Machine tool



FIG. 1 shows a front view of the design;

FIG. 2 shows a side view of the design from one side;

FIG. 3 shows a side view of the design from the other side;

FIG. 4 shows a top view of the design;

FIG. 5 shows a backside view of the design;

FIG. 6 shows a perspective view of the design; and,

FIG. 7 shows a perspective view of the design with retracted electrode changer section.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for machine tools, as shown and described. 